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• The Start
• The first Work Phase of Technical Committee GSM from the End 1982 to the End 1984
• The Development and Agreement of the Basic Parameters of the GSM System and the GSM MoU from Q4 1984 to Q3 1987
• The Development of the first Set of Specifications needed for Procurement activities of the Network Operators from Q2 1987 to the End of 1988
• The Development of the GSM Phase 1 Specifications for Service Opening from 1989 to 1990
• Start of GSM Phase 2 and inclusion of UMTS from 1990 to Q3 1991

• "Tele-political" situation in the 80's
• The organizational framework for GSM work in CEPT and ETSI